Functions for computing subscores for a test using different methods in both classical test theory (CTT) and item response theory (IRT). This package enables three sets of subscoring methods within the framework of CTT and IRT: Wainer's augmentation method, Haberman's three subscoring methods, and Yen's objective performance index (OPI). The package also includes the function to compute Proportional Reduction of Mean Squared Errors (PRMSEs) in Haberman's methods which are used to examine whether test subscores are of added value.
Package details 


Author  Shenghai Dai [aut, cre], Xiaolin Wang [aut], Dubravka Svetina [aut] 
Maintainer  Shenghai Dai <s.dai@wsu.edu> 
License  GPL (>= 2) 
Version  3.1 
Package repository  View on CRAN 
Installation 
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